Vibrationally mediated photodissociation dynamics of pyrrole
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F19%3A00517109" target="_blank" >RIV/61388955:_____/19:00517109 - isvavai.cz</a>
Alternative codes found
RIV/00216208:11320/19:10414683
Result on the web
<a href="http://hdl.handle.net/11104/0302391" target="_blank" >http://hdl.handle.net/11104/0302391</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1063/1.5091974" target="_blank" >10.1063/1.5091974</a>
Alternative languages
Result language
angličtina
Original language name
Vibrationally mediated photodissociation dynamics of pyrrole
Original language description
We investigate photo dissociation of vibrationally excited pyrrole molecules in a velocity map imaging experiment with IR excitation of N-H bond stretching vibration v(1) = 1, nu(IR) = 3532 cm(-1), and UV photodissociation at lambda(UV) = 243 nm. In the IR+UV experiment, the H-fragment signal is enhanced with respect to the 243 nm UV-only photodissociation due to a more favorable Franck-Condon factor for the vibrationally excited molecule. In the measured H-fragment kinetic energy distribution, the maximum of the fast peak in the IR+UV experiment is shifted by 0.23 eV compared to the UV-only photodissociation which corresponds to 53 % of the vibrational energy deposited into the fragment kinetic energy. We compare our results with an isoenergetic UV-only photodissociation at lambda(UV) = 224 nm. About 72 % of the total available energy, is released into the fragment kinetic energy in the IR+UV experiment, while it is only 61 % in the UV-only photodissociation. This can be substantiated by the coupling of the N-H bond stretching vibration into the kinetic energy of the departing H-fragment. We also probe the time-dependent dynamics by a nanosecond pump-probe experiment. The IR excitation enhances the N-H bond dissociation even when the UV photodissociation is delayed by 150 ns. This enhancement increases also the yield of the fast fragments at the position of the peak corresponding to the IR+UV excitation, i.e. even 150 ns after the IR vibrational excitation, the same amount of the IR excitation energy can be converted into the H-fragment velocity as immediately after the excitation. (C) 2019 Author(s).
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10403 - Physical chemistry
Result continuities
Project
<a href="/en/project/GA17-04068S" target="_blank" >GA17-04068S: Molecular Clusters as Unique Nano-reactors: Controlling Chemistry with Photons and Electrons</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
AIP Advances
ISSN
2158-3226
e-ISSN
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Volume of the periodical
9
Issue of the periodical within the volume
3
Country of publishing house
US - UNITED STATES
Number of pages
7
Pages from-to
035151
UT code for WoS article
000462880300099
EID of the result in the Scopus database
2-s2.0-85064668307